Lifting mechanism



June 23, 1931.

l. V. K. HOTT LIFTING MECHANISM Filed Dec. 17, 1928 2 Sheets-Sheet l WW w VK m

m \M h M R \M u n hm n m ml m \m m Fi -ZJ I I. V. K. HOTT LIFTING MECHANISM Filed Dec. 17, 1928 2 Sheets-Sheet 2 Y/A/VE/VTOR. 41/. K. HOTT June 23, 1931.

" ATTORNEY l atented June 23, 1 931 m V l uNrrEn stares: a n't: :rrrice ION VON KERT I-IO'IT, OF DAYTON, vOff-I10, .ASSIGNOR .TO "El-IE J'OYCE-CRIDLAND COMPANY,

GFDAYTON,"OHIO, A CORPORATION GE OHIO V Lrr'rm'e MEoHAN Isi/r Application filed December 17, 1928. Serial No. 326,422. This invention relates to a lifting mechathe upper portion of the casing and which' nism and more particularlyt an electrically is preferably in the form of a casting 8. In operated mechanism for'elevating an auto practice this upper portion of the top castm-obiletopermitaccesstobe had to the chassis mg of-the casing is usually embedded in a 5 thereof' for the purpose of lubricatingtheslab of concretewith its upper endsubstansame: tially flush withthe upper surface of the corn Oireobjectofthe invention is "to provide a crete. The casing is provided with a bearsimple-but efiicient lifting mechanism which ing of less diameter than the casing and this will be of' acompact arrangement and of a bearing is here shown at 9 at the upper end of s bl i h t the top casting 8 and 1s eccentricallyarranged A further obj ectof the invention is'to prowith relation to the casing. vide a lifting-mechanism of this character-1n Shdably mounted in the bearing 9 for verwhich-the lifting element and its operating tical movement with-relation to the casing;

, and-controlling devices, with the exception is a lifting element 10 which is preferably *ofthe-motor, will be supported'w-ithin the cylindrical in form and projects above the outer casing. 7 bearing. Rigidly secured to the upper end A; furtherobject of theinvention is to proof the lifting element is a transverse frame videa lifting mechanism ofthischaracter 7 member 11 on which are mounted two run- 7 having means for automatically interrupting Ways ortracks 12 to receive the wheels of the Qttheope-rationofthe motorwhen the lifting automobile which is to be elevated. The element reaches thelimitof its movement. liftlng element 10 is carried by asupporting Qth'er objects ofthe invention-will appear member 13 having its centralportion screw astlie mechanism is described in detail. threaded an'd'constituting a nut; as shown'at Intlie accompanying drawings Fig. 1 is 14, which engages an actuating screw 15 roatop plan view, partlybroken away, of tatably mounted at its lower end in a bear lifting*mechanisin'embodying my invention; ing 16 in the base 6 of the casing. The/sup- Fig: 2is.avertical sectional View taken on porting 1nember13 is here shown as substantheline 2-2'ofF-ig: l F-ig. 3 is a'transverse tially frusto-conical in shape and as having sectional View taken on the line-3 3 ofFig. at its outer edge acircumferential recess- 17 to"2;'F ig:4:-is-a tla-IISVQISQ SGCtlOHLlVlBW taken to receive the lgwer end of the cylindrical on-the line4-l of Fig: 2- and partly broken lifting element and rotatably support the away; and Fig; 5 isadetail elevation of the latter. v The supporting member 13 is held circuit-breakers and closers-and the actuating agalnst rotation and to this end may be prodevice therefor. vided with laterally extending lugs 18er- Iirthese drawings- I have i s d 0116 ranged to engage the circumferentialtwall embodiment of my invention but it will be of theiouter casing 7Q The screw 15 and nut. understood that this particularembodiment 14 are of low pitch so that the screw will has beenchosen for the-purpose of illustranot rotate under the influence of the loadlon tion only"anditliatthemechanism'may take the-nut but must be positively rotated ina to tamer-reforms and may be arranged in vareverse direction to lower the load.

riouseways without departing from the spirit Rigidly secured to the lower aortion ofthe of 'tlieinvention 7 screw, below the thread thereo is a gear 19 that formhere illustrated the lifting which is preferably of a diameter approxi mechanismcomprises-an outer casingadapt t l'y q al t th diam ter fth upp rted tobeembedde'd in the ground with its upi member, An anti-frictionbearin' 20 i perendfiirsli with thesurfaee of the ground 5 preferably interposed between the gear and As here shown,- this=casingcomprises a base 6 the base'6 ofthe casing to carry the weight of;

on which is mounted a cylindrical shell 7 the load on the screw. A vertical shaft 21 constituting thelower*portionof'thecasing is arranged 1n the outer casmgbetween the and ontlie upper'endof'which is supported circumferential wall thereof and the lifting element and is supported at its lower end in a bearing 22 carried by the base 6 and is supported at its upper end in a bearing 23 carried by the top casting 8. Rigidly secured to this shaft near the lower end thereof and, if desired, formed integral therewith, is a pinion 24: which meshes with two idle gears 25 both of which mesh with the gear 19. At its upper end the shaft 21 is provided with a beveled gear 26 which meshes with a beveled gear 27 on a shaft 28 of a motor 29. The motor is of the reversible type and is provided with a master switch 30 for controlling the operation thereof.

Means are provided to automatically interrupt the operation of the motor as the lifting element approaches the limit of its movement in either direction, to prevent the nut from being run off the screw or the mechanism injured in the event the operator should fail to actuate the master switch at the proper time. To this end two circuit breakers and closers 31 and 32 are interposed in the motor circuits, not shown, between the motor and the master switch in such a manner that the circuit breaker and closer 31 will control the rotation of the motor in the direction to lower the load and the circuit breaker and closer 32 will control the rotation of the motor in a direction to lift the load. These circuit breakers and closers are arranged within the casing and, as here shown, are mounted in a bracket 33 carried by the top casting 8. They may be of any suitable construction and are illustrated as of a well known type which need not be described in detail, except to note that each circuit breaker and closer comprises a yieldable plunger 34 having a tapered nose. A vertically movable actuating member 35 controls the positions of the plungers of the circuit breakers and closers and for this purpose is provided with a projection 36 the upper and lower edges of which are inclined to engage the beveled noses of the respective plungers. The shape and arrangement of the actuating device are such that when in its lowermost position, as shown in Fig. 5, the upper circuit breaker and closer will be opened, interrupting the downward movement of the lifting element, and the circuit breaker and closer 32 will be closed to permit the motor to rotate in a direction to elevate the lifting element. The actuating device is carried by a rod 37 arranged within the outer casing 7 alongside of the lifting element and slidably supported at its lower end in a vertical socket 38 in the base 6 and supported at its upper end in a bearing bracket 39 within the top casting 8. Rigidly secured to this red are flanged collars or stops 40 and 41, arranged respectively near the upper and lower ends thereof and in the path of a lug 42 carried by the supporting member 13 and arranged between the two stops. The arrangement of the stops is such that when the lifting element is moved to its lowermost position, as shown in Fig. 2, the lug 42 will engage the lower stop etl and move the actuating member to its lower position, as shown in Fig. 5, which, as stated, interrupts the rotation of the motor in a direction to lower the lifting element. When the master switch is moved to the up position, see Fig. 1, the motor will be operated in a direction to elevate the lifting element and the lifting element approaches the upper limit of its movement the lug 42 will engage the stop 40 and shift the actuating device to reverse the circuit breakers and closers, thereby interrupting the operation of the motor in a direction to elevate the lifting element. This upward movement of the actuating device also releases the plunger of the lower circuit breaker and closer 32 so that the motor circuit is in a condition to cause the motor to operate to lower the load when the master switch, is again shifted. The actuating device may be retained in its elevated position during the downward movement of the lifting element by the contact thereof with the plunger of the lower circuit breaker and closer 32 but in order to relieve this plunger of a portion of the weight of a rod 37 I prefer to provide means for counterbalancing the weight of that red. As here shown, this is done by interposing a light spring 43 between the bearing bracket 39 and the actua ing device.

The lifting element is braced against tilting movement by means of a guide flange at. extending inwardly from the wall of the top casting of the outer casing and extending about the lifting element for considerably more than half of its circumference, so as to brace the same against lateral movement in any direction. The ends of the flange 4d are spaced apart a distance suflicient to permit the passage of the shaft 21 and the rod 37.

vVhile I have shown and described one embodiment of my invention I wish it to be understood that I do not desire to be limited to the details thereof as various modificatrons may occur to a person skilled in the art.

-laving now fully described my invention, what I claim as new and desire to secure by Letters Patent, is: i

1. In a lifting mechanism of the character described, a casing, an actuating screw rotatably mounted in said casing, a supporting member having a screw threaded part engaging said screw and held against rotation, a lifting element rotatably mounted on said supporting member, a shaft mounted in said casing alongside of said lifting element, a gear train connecting said shaft with said screw, and a motor connected with the upper end of said shaft.

2. In a lifting mechanism of the character described, a cylindrical casing having a bearing near its upper end, said bearing being of less diameter than said casing and being arranged eccentrically with relation thereto, a cylindrical lifting element slidably mounted in said bearing, a nut having supporting connection with said lifting element and held against rotation, an actuating screw rotatably mounted in said casing and extending through said nut, a vertical shaft mounted in said casing at one side of said lifting element, gearing connecting said shaft with said screw, an electric motor connected with said shaft, a circuit breaker and closer for said motor, an actuating device for said circuit breaker and closer comprising a rod mounted for vertical movement in said casing at one side of said lifting element, a stop carried by said rod, and a part carried by said nut and engaging said stop to impart operative movement to said actuating device.

3. In a lifting mechanism of the character described, a cylindrical casing having a bearing near its upper end, said bearing being of less diameter than said casing and being arranged eccentrically with relation thereto, a cylindrical lifting element slidably mounted in said bearing, a nut having supporting connection with said lifting element and held against rotation, an actuating screw rotatably mounted in said casing and extending throughsaid nut, a vertical shaft mounted in said casing at one side of said lifting element, gearing connecting said shaft with said screw, an electric motor connected with said shaft, a pair of circuit breakers and closers for said motor arranged one above the other and each comprising a yieldable plunger, a rod mounted for vertical movement in said casing at one side of said lifting element, an actuating device carried by said rod and having inclined edges to engage the plungers of the respective circuit breakers and closers, stops carried by said rod and spaced apart, a

part carried by said nut and arranged between said stops to impart lengthwise'movement to said rod when said lifting element approaches either limit of its movement, and means for counterbalancing the weight of said rod and said actuating device.

4. In a lifting mechanism of the character described, a casing comprising a base, a cylindrical shell carried by said base, and a top casting carried by said shell and having a bearing of less diameter than said shell, an actuating screw rotatably supported on said base, a nut mounted on said screw and having a circumferential portion, a cylindrical lifting element rotatably supported on the circumferential portion of said nut and slidably mounted in said bearing, a gear secured to said screw below the threaded portion thereof, a vertical shaft mounted in said casing alongside of said lifting element, a gear train for connecting said shaft with the first men- 'ment in one direction.

tioned gear, and a motor connected with said shaft.

5. In a lifting mechanism of the character described, a substantially cylindrical casing adapted to be embedded in the ground with its upper end adjacent to the surface of the ground, said casing having near its upper end a bearing of less diameter-than the body of said casing, a lifting element mounted for vertical movement in said bearing, a nut connected with said lifting element and held against rotation, an actuating screw rotatably mounted in the lower portion of said casing and having threaded engagement with said nut, a vertical operating shaft mountedin said casing and alongside of said lifting element, gearing connecting said shaft with said screw below said lifting element, and means connected with said shaft near the upper end of said casing for rotating the same.

6. In a lifting mechanism of the character described, a substantially cylindrical casing adapted to be embedded in the ground with its upper end adjacent to the surface of the ground, said casing having near its upper end a bearing of less diameter than the body of said casing, a lifting element mounted for vertical movement in said bearing, a nut connected with said lifting element and held against rotation, an actuating'screw rotatably mounted in the lower portion of said casing and having threaded engagement with said nut, a vertical operating shaft mounted in said casing and alongside of said lifting element, gearing connecting said shaft with said screw below said lifting element, means connected with said shaft near the upper end of said casing for rotating the same, and means within said casing and controlled by the movement of said lifting element to in terrupt the rotation of said shaft when said lifting element reaches the limit of its moves 7. In a lifting mechanism of the characte described, a substantially cylindrical casing adapted to be embedded in the ground with its upper end adjacent to the surface of the ground, said casing having near its upper end a bearing of less diameter than the body of said casing, a lifting element mounted for 7 vertical movement in said bearing, a nut connected with saidlifting element and held against rotation, an actuating screw rotatably mounted in the lower portion of said casing and having threaded engagement with said nut, a vertical operating shaft mounted in said casing andalongside of said lifting element, gearing connecting said shaft with said screw below said lifting element, a motor having driving connection with said shaft, a circuit breaker and closer connected with said motor, a rod mounted for longitudinal movement in said casing and extending lengthwise of said lifting element, means carried by said rod'for actuating said circuit breaker and closer, and a part movable with said lifting element to impart longitudinal movement to said rod when said lifting element approaches the limit of its movement in one direction.

8. in a lifting mechanism of the character described, a substantially cylindrical casing, an actuating screw rotatably mounted in said casing on an axis arranged eccentricaily with relation to said casing, a supporting member having a screw threaded part engaging said screw and having a part engaging said casing to hold said member against rotation, a lift ing element carried bv said supporting mem her, a vertical shaft mounted in said casing alongside of said lifting element, gearing con necting the lower portion of said shaft with said screw, and a motor connected with said shaft near the upper end of said casing.

9. In a lifting mechanism of the character described, a substantially cylindrical casing, an actuating screw rotatably mounted in said casing on an axis arranged eccentrically with relation to said casing, a supporting member having a screw threaded part engaging said screw and having a part engaging said casing to hold said member against rotation, a lifting element carried by said supporting member, a gear secured to said screw, a shaft rotatably mounted in the lower portion of said casing and extending upwardly between the wall of said casing and said lifting element to a point near the top of said casing, a pinion carried by said shaft near the lower end thereof, intermediate gearing connecting said pinion with the first mentioned gear, and a motor connected with the upper end of said shaft.

10. In a lifting mechanism of the character described, asubstantially cylindrical casing having a bearing near its upper end, said bearing being of less diameter than said casing and being arranged eccentrically with relation thereto, a cylindrical lifting element slidably mounted in said bearing, a nut having supporting connection with said lifting element and held against rotation, an actuating screw mounted in said casing and extending through said nut, a vertical shaft rotat ably mounted in the lower portion of said casing and extending upwardly between said casing and said lifting element, gearing connecting the lower end of said shaft with said screw and a motor connected with the upper end of said shaft.

11. In a lifting mechanism of the character described, a cylindrical casing having a bearing near its upper end, said bearing being of less diameter than said casing and being ar ranged eccentrically with relation thereto, a cylindrical lifting element slidably mounted in said bearing, a nut having supporting connection with said lifting element and having laterally extending lugs to engage the cylindrical wall of said casing and hold said nut against rotation, an actuating screw rotatably mounted in said casing and extending through said nut, a vertical shaft rotatably mounted in the lower portion of said casing and extending upwardly between said casing l hereto.

ION VON KERT HOTT. 

